Mechanical movement.



No. 683,8!0. Patented (lot. I, I90l. J. E. SWEET.

MECHANICAL MOVEMENT.

(Application filed Jan. 16, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

JOHN E. SWEET, OF SYRACUSE, NEW YORK.

M ECHANIGAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 683,810, dated October 1,1901.

Application filed January 16, 1901. Serial No. 43,533- (No model.)

To all whom, it ntay concern:

Be it known that I, JOHN E. SWEET, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Mechanical Movements; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to mechanical movements, the object being to furnish a simple portable mechanical device for giving two simultaneous movements to a vertical spindle, one rotary at a given speed on its own axis and the other a linear horizontal movement at a changeable speed, either fast or slow, not dependent on the rotary velocity of the spindle. The spindle may be employed for operating a revolving end mill or cutter such as is used for obtaining flat or plane surfaces, as in the refacing of valve-seats or other work of like character. Such a device is shown in the accompanying-drawings for purposes of illustration.

The nature of the invention consists in the employment of a worm or tangent gear on the vertical spindle supported in a traversing or sliding head carried on horizontal parallel ways, said worm-gear being engaged on opposite sides by two long screws mounted parallel to each other in a frame and geared together at one extremity, so as to be. rotated in opposite directions when rotary motion is applied to one of them, rotary motion being thus imparted to the worm-gear and vertical spindle and at the same time a longitudinal horizontal motion according to the inequality in the numbers of the teeth of said gears on the worms or screws.

In the drawings forming a part of this specification I have shown by way of illustration such a device with a milling-tool applied to the steam-chest of an engine as if in use for refacing the valve-seat.

Figure 1 is a plan view, the driving-pulley being in section and the upper part of the travelling head removed. Fig. 2 is a longitudinal vertical section through the center with the driving-pulley removed.

a is the base of the work under treatment,

which in the drawings represents a portion of a steam-chest including the valve-seat b.

c is the rotary end mill or cutter. These cutters are removable and exchangeable.

d is the vertical rotary spindle of the cutter.

e is the worm-gear on the rotary spindle, carried in the sliding-head m.

n n are parallel ways for the sliding head.

f 'v are the two long parallel worms or screws, mounted in frame 0, engaging the teeth of the worm-gear e.

g y are removable gears mounted on the worm-shaftsfr at the end, (lefthand,) so as to intermesh. Others are provided having teeth of difierent ratios numerically, so as to be interchanged and give different rates of travel to the spindle. l

p p are nuts for holding the gears g y removably in place.

71. is a pulley by which the worm fis driven from any prime motion by belting. Any other form of gear may be employed.

21 is a clutch-bar engaging and disengaging the pulley h on the worm-shaft f.

j is an adjustable step-screw by which the position of the rotary cutter may be adjusted vertically.

q is a clamp-screw engaging spindle cl in groove 1' to hold it firmly in engagement with rotary gear e.

Zlare crossways on which the frame 0 is mounted, so that it can be traversed to take a new cut.

70 is a screw for traversing the frame 0.

The operation is as follows: The worms f n being brought into engagement with drivingpulley h by means of clutch i the worm-gear e rotates, carrying with it the milling-cutter con spindle d. If the geary have more teeth 2'. e., a longer pitch-linethan gear g, with which it is in engagement, as is designed to be shown in the drawings, the worm n will rotate slower than worm f, thus causing worm- 9 5 gear 6, spindle cl, and sliding head m to advance in the direction of the arrow with a speed proportionate to the difference in the velocities of the respective worms, which is dependent on the difierence in the number of Ion teeth in the gears g y. By reversing the positions of the said gears, placing the larger one on worm-shaft f, the feed will be in the opposite direction. By removing one of the change-gears and substituting a crank the slidinghead with spindle may be moved back or located in any desired position. By replacing gear y with one having the same nu mber of teeth as g the cutter will revolve Without being fed in either direction, and by applying a crank to screw is the frame may be traversed so as to take a new out, and so on until the Whole surface to be refaced has been gone over. The height of the cutter and depth of the cut may be at any time adjusted by means of the adjusting step-screwj.

I claim and desire to secure by Letters Patent- 1. A mechanical movement, comprising two worms or screws mounted parallelly, means for rotating said Worms, a worm-gear in engagement with said Worms, and intermeshing gears of unequal size mounted on said Worms, whereby the said worm-gear Will both revolve and travel when said worms are rotated.

2. A mechanical movement, consisting of a frame, parallel Ways in said frame, a sliding head mounted on said ways, a vertical rotary shaft mounted in said sliding head, a wormgear on said shaft, parallel worm screws mounted in said frame in engagement with said Worm-gear on opposite sides, intermeshing gears mounted on said worm-screws, and means for applying rotary movement to one of said screws, substantially as specified.

3. A mechanical movement consisting of a traversing frame, parallel ways supporting said frame, means for traversing said frame, parallel guideways in said frame at right angles to the supporting-ways, a sliding head on said guideways, a revoluble wormgear mounted in said sliding head, a vertical spindle adjustably mounted in said Worm-gear, parallel worm-screws mounted in said frame in engagement With said worm-gear on opposite sides, removable intermeshing gears of unequal pitch-lines mounted on said screws, and means for applying rotary movement to one of said screws, thereby rotating and traversing said spindle, substantially as specified.

In testimony whereof I aifix my signature in presence of two witnesses.

JOHN E. SVEET.

YVitnesses:

W. T. POWERS, J. S. DAVIS. 

